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VENT PIPE Filed April 17. 1929 fi 4 nf E H 20 H17 gl i! 4 ll g 7 i INVENTOR v 7 MUM Patented. Dec. 13, 1932 UNITED STATES JAMES S. BLACKMORE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO AUTOMATIC,

GAS STEAM RADIATOR COMPANY, OF PITTSBURGH,

'I'ION OF PENNSYLVANIA PATENT OFFICE.

PENNSYLVANIA, A CORPORA- VENT PIPE Application filed April 17,

My invention relates to vent pipes and more particularly to vent pipes for products of combustion in residential, store and office buildings.

Where temporary heaters burning a fuel are installed in residential, oflice and/or store rooms, the problem of disposing of products of combustion is present. In many cases where gas and high grade fuel oils are burned the products of combustion are liberated directly into the room. The presence of such products of combustion pollutes the air by liberating quantities of smoke, carbon monoxide, carbon dioxide and water; The presence of the water increases the humidity of the room considerably. Itis an established fact that persons remaining in such anatmosphere for considerable periods of time suffer some physical discomfituret Where the products of combustion are led away by a vent pipe orchimney, the exposed pipe or chimney is often unsightly and inconvenient in that its presence renders the zone through which it extends unsuitable for other purposes, such as shelving, movement of persons, and the like. Where the vent pipe extends into a part1- tion wall, fire regulations require that the vent pipe be surrounded by a masonry wall. If the partition wall is in a completed building, the remodeling of the building, to provide a masonry or ceramic chimney flue, which must in most cases extend through to the basement of the building for its own support, is exceedingly expensive. Also, the dimensions of such fiues or chimneys are generally in excess of the thicknesses of partition walls, so that a chimney placed in a partition must be separated from the passageway through which the products of combustion move by a body of insulating material.

I provide. avent pipe for use in partition walls in which an inner sectional metallic column is surrounded by an external metallic 1929. Serial No. 355,972;

time, provide a column of insulating air between the inner and outer vent column, which an column is thick enough to maintain the outer column below a temperature which might be dangerous to surrounding timbers and the like. Means are provided for insurmg a uniform spacing between the inner and outer columns.

To prevent the water of condensation existing in the vent p.pe from following down a pipe connected at a flue opening in the vent, after a flame has been extinguished or materially reduced, I provide drainage means in the flue opening for the vent pipe and I also provide a chamber for collecting the water of condensaton. If desired, means may be provided for discharging the condensed water from the vent pipe. In other cases the water of condensation remains in the vent pipe and is later revaporized upon a subsequent heating of the vent pipe.

The accompanying drawing illustrates the present preferred embodiment of the invention, in which Figure l is a broken vertical sectional view of a portion of a vent pipe embodying my lIlVel'lLlOn,

Figure 2 is a perspective View of one of the sections constituting the inner column,

Figure 3 is a similar view of a section hav lating column 6 of air between the columns 4 and 5. The columns 4 and 5 are each constituted by a plurality of metallic sections placed end to end. Spacing blocks 7 are carried by one of the columns, preferably the in 5 ner column, for separating the columns 4 and 5, although it is to be understood that the spacing blocks need not be integral with either column if desired.

The inner column 1 is constituted by a plurality of sections 8 of substantially uniform shape and size and a section 9 having a flue opening or thimble 10 for the connection of a pipe leading to a burner. Vb-ere the size of the connected burner makes it possible, the section 9 is placed at the bottom of the column 1. The weight of the vent pipe is such that it may rest upon floor joists with out the necessity of continuing the column downwardly to the bottom of the building for its own support, as is necessary in a chimney of masonry structure.

The bottom of the section 9 is closed by an end wall 11 in which a threaded opening 12 is formed. The opening 12 may be closed by a plug 14 or the opening may be left open if desired. As products of combustion, particularly those resulting from the burning of gas, contain considerable quantities of water vapor, there is a considerable amount of wa- 303 ter of condensation when the vent pipe cools either by extinguishing the burner or materially reducing the flame. Some of the water of condensation collects along the walls of the vent pipe and tends to drip downwardly f along the walls, while some of the water of condensation settles directly to the bottom of the vent pipe. Unless provision is made for caring for the water of condensation, it tends to flow out at the bottom of the vent pipe and discolor adjacent objects such as floors and partition walls. By closing the end of the section 9, such water of condensation is trapped and remains in the section until it is subsequently reheated when the water revaporizes and escapes through the vent pipe. If the opening 12 is left open, it may be con nected by a drain pipe 15 to a waste pipe so that the water of condensation passes directly out of the pipe. In neither case, however, does the water of condensation leak out of the vent pipe over adjacent building structures.

The water of condensation dripping down the walls of the vent pipe tends to collect around the flue opening 10 and, unless pro- T vision is made for preventing it, the water falls at the connected pipe down into the burner. For preventing movement of water along the connected pipe, I provide the line opening 10 with a drainage passageway 16 in which the water may collect and flow back into the section 9.

The upper end of the section 9 is provided with a tapered or chamfered surface 17 which cooperates with a complementary sloping edge 18 on one of the sections 8. The opposite end of each section 8 is provided with a tapering surface 19, similar to the surface 17 on the section 9. Accordingly, when the sections 8 and 9 are assembled in end to end relation, the complementary edges seat in each other and prevent accidental displacement of the sections. For further clamping the sections, certain of the spacing blocks 7 are provided with perforated cars 20, preferably disposed at the ends of the'flue, through which clamping bolts 21 extend. The sections 8 and 9 are made of thin metal, preferably by a casting operation.

The sections 5 are made up of sections of thin sheets of metal, either cast or stamped, which are secured to certain of the spacing blocks 7 by screws 22 extending into the ends of the blocks 7, although it is to be understood that other securing means may be used within the spirit of the invention and scope of the appended claims. The sections comprising the cloumn 5 may he slipped over the sections 8 as units or they may be assembled around the column 4 as it is built up. By reason of the flue opening 10 in the section 9, the portion of the column 5, surrounding it, must be assembled in situ. The sections of the column 5 are connected by plates 24, through which securing means 25, such as bolts, extend. The lower portion of the column 5 is provided with openings 27 through which air may pass to and from the insulating space between the inner and outer colun'nis 4i and 5, respectively.

A vent pipe embodying my invention may be made with an overall dimension of less than four inches, which is the standard thick ness of partition studding and at the same time provide an air column of at least half an inch between all portions of the inner and outer columns. It is to be understood, however, that the foregoing dimensions are given by way of illustration and are not lin1- itations of the invention. The presence of the air column between the inner and outer metallic columns provides suflicient heat insulation to insure that the outer column is maintained below a temperature to ignite abutting framing timbers and the like. The vent pipe is insertible into a standard building partition without projecting beyond the surfaces thereof. This construction eliminates bulky masonry and ceramic structures such as constitute the chimneys heretofore used in connection with burners connected to vent pipes.

While I have shown and described the present preferred embodiment of the invention, it is to be understood that it may be otherwise embodied within the spirit of the invention and the scope of the appended claims.

I claim as my invention:

1. A metallic vent section having a flue opening therein said opening being restricted by an inwardly projecting flange extending approximately entirely around the opening, and a passageway formed in a wall of said section adjacent said flue opening and extending through said inwardly projecting flange for draining accumulations of liquid from said opening.

2. A vent structure comprising an internal column of metallic sections, adjacent ends of said sections each bearing a combined spacer and connection, means for securing said connections together, and an external column surrounding the internal column and maintained in spaced relation with respect thereto by said spacers.

In testimony whereof I have hereunto set my hand.

JAMES S. BLACKMORE. 

